scholarly journals Model Predictive Control of Offshore Power Stations With Waste Heat Recovery

2016 ◽  
Vol 138 (7) ◽  
Author(s):  
Leonardo Pierobon ◽  
Richard Chan ◽  
Xiangan Li ◽  
Krishna Iyengar ◽  
Fredrik Haglind ◽  
...  
Keyword(s):  
Model Predictive Control ◽  
Control Systems ◽  
Predictive Control ◽  
Gas Turbines ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Oil And Gas ◽  
Waste Heat ◽  
Integral Control ◽  
Power Stations

The implementation of waste heat recovery units on oil and gas offshore platforms demands advances in both design methods and control systems. Model-based control algorithms can play an important role in the operation of offshore power stations. A novel regulator based on a linear model predictive control (MPC) coupled with a steady-state performance optimizer has been developed in the simulink language and is documented in the paper. The test case is the regulation of a power system serving an oil and gas platform in the Norwegian Sea. One of the three gas turbines is combined with an organic Rankine cycle (ORC) turbogenerator to increase the energy conversion efficiency. Results show a potential reduction of frequency drop up to 40% for a step in the load set-point of 4 MW, compared to proportional–integral control systems. Fuel savings in the range of 2–3% are also expected by optimizing on-the-fly the thermal efficiency of the plant.

scholarly journals Waste Heat Recovery for Offshore Applications

2012 ◽  
Author(s):  
Leonardo Pierobon ◽  
Rambabu Kandepu ◽  
Fredrik Haglind
Keyword(s):  
Gas Turbine ◽  
Thermal Energy ◽  
Gas Turbines ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Oil And Gas ◽  
Waste Heat ◽  
Offshore Platforms ◽  
Organic Rankine Cycles ◽  
Heat Loads

With increasing incentives for reducing the CO2 emissions offshore, optimization of energy usage on offshore platforms has become a focus area. Most of offshore oil and gas platforms use gas turbines to support the electrical demand on the platform. It is common to operate a gas turbine mostly under part-load conditions most of the time in order to accommodate any short term peak loads. Gas turbines with flexibility with respect to fuel type, resulting in low turbine inlet and exhaust gas temperatures, are often employed. The typical gas turbine efficiency for an offshore application might vary in the range 20–30%. There are several technologies available for onshore gas turbines (and low/medium heat sources) to convert the waste heat into electricity. For offshore applications it is not economical and practical to have a steam bottoming cycle to increase the efficiency of electricity production, due to low gas turbine outlet temperature, space and weight restrictions and the need for make-up water. A more promising option for use offshore is organic Rankine cycles (ORC). Moreover, several oil and gas platforms are equipped with waste heat recovery units to recover a part of the thermal energy in the gas turbine off-gas using heat exchangers, and the recovered thermal energy acts as heat source for some of the heat loads on the platform. The amount of the recovered thermal energy depends on the heat loads and thus the full potential of waste heat recovery units may not be utilized. In present paper, a review of the technologies available for waste heat recovery offshore is made. Further, the challenges of implementing these technologies on offshore platforms are discussed from a practical point of view. Performance estimations are made for a number of combined cycles consisting of a gas turbine typically used offshore and organic Rankine cycles employing different working fluids; an optimal media is then suggested based on efficiency, weight and space considerations. The paper concludes with suggestions for further research within the field of waste heat recovery for offshore applications.

Nonlinear Model Predictive Control Strategies for a Parallel Evaporator Diesel Engine Waste Heat Recovery System

2016 ◽  
Author(s):  
Adamu Yebi ◽  
Bin Xu ◽  
Xiaobing Liu ◽  
John Shutty ◽  
Paul Anschel ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Model Predictive Control ◽  
Predictive Control ◽  
Nonlinear Model ◽  
Pid Control ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Nonlinear Model Predictive Control ◽  
Working Fluid

This paper discusses the control challenges of a parallel evaporator organic Rankine cycle (ORC) waste heat recovery (WHR) system for a diesel engine. A nonlinear model predictive control (NMPC) is proposed to regulate the mixed working fluid outlet temperature of both evaporators, ensuring efficient and safe ORC system operation. The NMPC is designed using a reduced order control model of the moving boundary heat exchanger system. In the NMPC formulation, the temperature difference between evaporator outlets is penalized so that the mixed temperature can be controlled smoothly without exceeding maximum or minimum working fluid temperature limits in either evaporator. The NMPC performance is demonstrated in simulation over an experimentally validated, high fidelity, physics based ORC plant model. NMPC performance is further validated through comparison with a classical PID control for selected high load and low load engine operating conditions. Compared to PID control, NMPC provides significantly improved performance in terms of control response time, overshoot, and temperature regulation.

scholarly journals New Control Systems Facilitate Reconfiguring Aeroderivative Gas Turbines for Cogeneration

1996 ◽  
Author(s):  
David Moore
Keyword(s):  
New Zealand ◽  
Control Systems ◽  
Gas Turbines ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Heat Recovery Boiler ◽  
Total System ◽  
Paper Briefly ◽  
Dairy Plant

This paper briefly sets out the requirements for additional steam capacity at Anchor Products dairy plant at Te Awamutu in New Zealand and the reasons for choosing to use a relocated Turbo Power & Marine Twin Pac with a new waste heat recovery boiler together with an existing coal fired boiler to meet this demand. The paper then discusses the decision to replace the gas turbine and generator controls in their entirety, their integration with the controls for the new and existing boilers, and the architecture adopted for the total system. The philosophy of the control of the plant is then developed which leads to detailed discussion of the implementation of various modes of control of the plant, including, cogeneration control, co-ordinated control peaking control and compensate control and the methods of changing between the various modes of control. Finally, the paper includes a section on commissioning the plant.

Model predictive control for improving waste heat recovery in coke dry quenching processes

Energy ◽  
2015 ◽  
Vol 80 ◽  
pp. 275-283 ◽  
Author(s):  
Kai Sun ◽  
Chen-Ting Tseng ◽  
David Shan-Hill Wong ◽  
Shyan-Shu Shieh ◽  
Shi-Shang Jang ◽  
...  
Keyword(s):  
Model Predictive Control ◽  
Predictive Control ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Dry Quenching
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